package com.hxl.servlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class HelloServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //this.getInitParameter()     初始化参数
        //this.getServletConfig()     Servlet配置
        //this.getServletContext()    Servlet上下文

        ServletContext context = this.getServletContext();

        String username = "哈哈哈"; //如果这里的值是中文，就要注意编码和响应
        context.setAttribute("username",username); //将一个数据保存在了ServletContext中，名字为username，值为username

    }

}
